> > The slightly more fundamental problem is that we need a <4GB 
> > allocation zone in Xen, but since allocating the apperture is only 
> > currently an issue for dom0 it won't actually be a problem in 
> > practice. (something we need to address before driver domains come 
> > back)
>
> I have a patch that introduces zones into xen, and a 
> hypercall to request dmaable memory, which i've made 
> xen_contig_memory() use.
The hypercall should probably pass in the 'order' of the address limit
required for the allocation. There are a few stupid devices that require
memory below 2GB etc (e.g. aacraid)
> Unfortunately, there still seems to be some places where 
> kmallocs are done for dma buffers. (i tried putting all linux 
> memory into ZONE_NORMAL and caught a couple of these places)
Can you give examples? What size are the allocations? Do you know what
the official position is i.e. is using kmalloc with ZONE_DMA deprecated?
Thanks,
Ian
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